Patent GB-837895-A (GB)
Title: Diisocyanate modified polycarbonates
IPC: C08G18/44
Filed: 1956-07-06
Abstract: An elastomeric, polymeric resinous material is made by reacting an organic diisocyanate with a polycarbonate having an hydroxyl number of 15-200 and obtained either (a) by reacting a dialkyl carbonate or phosgene with di-, tri- or polyethylene glycol, the corresponding propylene glycols, mixed polyethylene-polypropylene glycol, tetramethylene glycol or pentamethylene glycol or (b) by reacting an aliphatic dibasic acid, a glycol and an alkylene carbonate.  The polyesterification mixtures for forming the polycarbonates may also include polyhydroxy compounds, e.g. glycerol, pentaerythritol, trimethylolpropane or 1 : 2 : 6-trihydroxyhexane.  In making the elastomers, the polycarbonates may be admixed with other polyesters, e.g. those of Specification 787,760.  Cellular elastomers are made by adding water to the reaction mixture and also, preferably, a dispersing agent e.g. an amine salt of a fatty acid or a polyethylene or polypropylene glycol ester or ether.  Catalysts for the diisocyanatepolycarbonate reaction are sodium carbonate, sodium acetate, sodium ricinoleate, tertiary amines and amino alcohols or their esters.  Fillers or pigments may be incorporated.  In examples foams were made by reacting (1) a polycarbonate from diethyl carbonate and diethylene glycol with toluene diisocyanate in the presence of water, nonylphenol pentadecaoxyethylene ether and 2.6-lutidine.  (2) A polycarbonate from diethyl carbonate, diethylene glycol and 1.5-pentanediol with toluene diisocyanate in the presence of water and bis (diethylaminoethyl) adipate. (3) A polycarbonate from adipic acid, diethylene glycol, trimethyl ethane and ethylene carbonate with toluene diisocyanate in the presence of water; bis (diethylaminoethyl) adipate and diethylamine oleate.  (4) A polycarbonate from adipic acid, diethylene glycol, ethylene carbonate and trimethyl propene with toluene diisocyanate in the presence of water, pyridine, diethylamine oleate and sodium ricinoleate.  (5) A polycarbonate from diethylene glycol, pentaerythritol and phosgene with toluene diisocyanate in the presence of phthalocyanine blue, collidine, water and the polyethylene glycol ester of tall oil acids. (6) The polycarbonate of Example 5 with toluene diisocyanate in the presence of water and a polyethylene glycol ester of tall oil acids. (7) The polycarbonate of Example 5 with dianisidine diisocyanate in the presence of triethylamine, water and the polyethylene glycol ether of sorbitan monolaurate.  (8) The polycarbonate of Example 5 with bitolylene diisocyanate in the presence of water, a polyethylene glycol monoester of tall oil acids and collidine.  (10, (11), (12), (13), (15) A polycarbonate from diethylene glycol, pentamethylene glycol, glycerol and phosgene with toluene diisocyanate in the presence of water; and (10) diethylethanolamine and a polyethylene glycol monoester of tall oil acids; (11) diethylethanolamine, heliogen green and a polyethylene glycol monoester of tall oil acids; (12) methylmorpholine, a polyethylene glycol monoether of a p-alkylphenol and methylglucoside; (13) a polyethylene glycol ether of sorbitan monolaurate and talc; (15) a polyester of adipic acid, diethylene glycol and pentaerythritol.  In further examples rubbers were made by reacting (9) a polycarbonate from diethylene glycol, pentamethylene glycol, glycerol and phosgene with toluene diisocyanate.  (14) A polycarbonate from diethylene glycol, pentamethylene glycol, glycerol and phosgene with toluene diisocyanate.  Specifications 779,077 and 789,754 also are referred to.ALSO:An elastomeric polyurethane foam is made by reacting an organic polyisocyanate with certain linear or branched aliphatic polycarbonates having a hydroxyl number of 15-200 (see Group IV(a)), the reaction being effected in the presence of water and, preferably, a dispersing agent (e.g. an amine salt of a fatty acid or an ester or ether of a polyethylene glycol or a polypropylene glycol).  The reaction may also be effected in the presence of (a) another polyester, e.g. one of those of Specification 787,760; (b) a catalyst, e.g. sodium carbonate, sodium acetate, sodium ricinoleate, a tertiary amine, or an amino alcohol or ester thereof or (c) a filler or pigment, e.g. phthalocyanine blue, heliogen green or talc or, in example 12, (d) methyl glucoside. Specifications 779,077 and 789,754 also are referred to.